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Net income (loss) per share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Reconciliation of Numerator and Denominator in Basic and Diluted Net Income (Loss) Per Common Share Computations
The following is a reconciliation of the numerator and denominator in the basic and diluted net income (loss) per common share computations (in thousands, except share and per share data):
 
Year ended December 31,
 
2018
 
2017
 
2016
Numerator:
 

 
 

 
 

Net income
$
15,525

 
$
33,475

 
$
5,313

Adjustments to numerator:
 
 
 
 
 
Dividend paid to preferred stockholders
—

 
—

 
(66,531
)
Accretion of convertible preferred stock to maximum
   redemption value
—

 
—

 
(436,317
)
Net income (loss) attributable to common stockholders
$
15,525

 
$
33,475

 
$
(497,535
)
 
 
 
 
 
 
Denominator:
 
 
 
 
 
Weighted average common shares outstanding - basic
46,828,798

 
45,358,452

 
12,606,529

Dilutive common equivalent shares from equity awards
2,439,818

 
4,016,306

 
—

Weighted average common shares outstanding - diluted
49,268,616

 
49,374,758

 
12,606,529

 
 
 
 
 
 
Net income (loss) per share:
 
 
 
 
 
Basic
$
0.33

 
$
0.74

 
$
(39.47
)
Diluted
$
0.32

 
$
0.68

 
$
(39.47
)
 
 
 
 
 
 
Weighted average anti-dilutive shares from outstanding equity awards excluded from diluted earnings per share
3,373,529

 
1,176,787

 
7,591,298